T-Mobile/Wifi-calling: Data usage on home wifi counts as mobile data

Recently, I switched to T-Mobile USA with my iPhone 5S and enabled WIFI-calling. Since then, my mobile data volume has gone up drastically. T-Mobile counts data usage on my home wifi network as well to the mobile data volume. I know this, because there is mobile data traffic stated on my bill during times when I was at home for sure, i.e. at night. T-Mobile says they can't do anything about it and I should just buy more full speed data volume. Does anyone have the same issue?

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Be sure to turn off your data connection when at home. It's possible that your phone is switching to data when it is out of range of your wifi.

Here's how to turn off data:

1. Touch Settings.
2. Touch Cellular. ...
3. Touch the Data Roaming to change the setting (e.g., from on to off).
4. Data roaming is now off. Touch Data roaming again to turn it on. ...
5. To switch data off completely, touch the Cellular Data.
6. Data services are now off. Touch Cellular Data again to turn data services on.

No. Can't say that I have that problem with my Galaxy S2. Perhaps it has something to do with IOS and the WiFi calling app. Tavenger5 probably has the best solution. I don't think that it's supposed to if you ave your phone configured properly. This article has information regarding WiFi calling on the Iphone 6: Review: Seamless, Integrated Wi-Fi Calling on the iPhone 6 | Re/code From reading it, I guess that you could actually put the phone on Airplane Mode also to completely stop cellular while at home.